
#include <iostream>
#include <string>

int main() {

    std::string str1 = "hello string";
    str1 += 10;

    std::cout << str1 << std::endl;
    

    std::string str2 = "hello string ";
    str2 += std::to_string(20);

    std::cout << str2 << std::endl;

    return 0;
}